[immodule-qt] a environment variable to control the module

[Leon Ho]

Hi all,

I have called to apply immodule-qt in latest qt package in our distro
now. It is now in but I think I have to ask to apply the kate and
konsole patches for it too.

Anyway, what do you guys think of adding a environment variable to
control which module to use for user to swap around between module
easily. (ie. QT_IM_MODULE=xim to load XIM etc) Is it a good idea?

Thanks,
Leon